linux-kernel - Re: sysfs: tagged directories not merged completely yet

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Date:	Wed, 15 Oct 2008 08:42:04 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Tejun Heo <tj@...nel.org>, Greg KH <greg@...ah.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	Benjamin Thery <benjamin.thery@...l.net>,
	linux-kernel@...r.kernel.org, Al Viro <viro@....linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: sysfs: tagged directories not merged completely yet

Quoting Eric W. Biederman (ebiederm@...ssion.com):
> "Serge E. Hallyn" <serue@...ibm.com> writes:
> 
> > Again fuse doesn't address the *core* issue (sysfs needing a way to
> > create files for multiple devicenames with same name).  But I believe
> > Benjamin was looking into a minimal patch to fix that.  Benjamin,
> > have you gotten anywhere with that?
> 
> I would love to hear a minimal strategy for that.

Oh I just meant for kernel-space.  So if a container is creating lo,
it will create a device named lo, but the sysfs file will be called
lo_1 or something.

> The only minimal strategy user space wise is to create multiple superblocks.
> Anything else I an think of violates backwards compatibility.

Yes, the above would require that the container either not mount
sysfs, ignore sysfs, or tweak sysfs using
	mount -t tmpfs none /sys/class/net
	mount --bind /sys/devices/virtual/net/lo_1 /sys/class/net/lo
or using fuse.

I'd definately prefer the sysfs tagging approach.  But I'd prefer
the above over never being able to use network namespaces on a
standard distro (with sysfs enabled).

-serge
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